Bad Service

Since moving over from Nashua Mobile I have had endless hassles with MTN, they put a limit on my contract, which was never in place before. I have had to try and increase my limit with them and it took 3 months to get right, now there is issues with my data bundle, say that I have used up all my Pre paid data, but I am no on Pre Paid and I pay my account each month, so there should be no issue.<br> <br> I want to cancel my contract and move to another service provider, but no response